Steel pump jack with safety latch and method
An upper shackle assembly for a steel pump jack for a wood pole includes a u-shaped shackle component to receive the wood pole. The assembly includes a crank handle that extends through the shackle component and engages the pole to lower the pump jack down the pole. The assembly includes a brake attached to the shackle component to engage with the pole if the crank handle fails. A method for installing a steel pump jack to a wood pole includes the steps of placing a u-shaped shackle component about the wood pole. There is the step of closing a brake with the shackle component to engage with the pole if a crank handle fails. There is the step of extending the crank handle through the shackle component to engage the pole. A steel pump jack.
1. A method for installing a steel pump jack to a wood pole comprising the steps of:
placing a u-shaped shackle component of an upper shackle assembly about the wood pole;
closing a brake of the assembly with the shackle component to engage with the pole if a crank handle of the assembly fails including the steps of moving a latch plate of the brake from an open position to a partially closed position with the shackle component, the latch plate having a first side and a second side, the first side has a latch tab and the second side has a slot and a cover rib, the cover rib has a hole, the hole in the cover rib receives an end of the crank handle; sliding the latch plate into a closed position where the latch plate tab of the latch plate is inserted into the slot of the shackle component; inserting a pin into a latch plate hole of the latch plate tab to hold the latch plate in place with the shackle component during use; and
extending the crank handle through the shackle component to engage the pole.
2. The method as described in claim 1 wherein the latch plate includes a rib which catches with the wood pole if the crank handle fails.
3. The method as described in claim 2 wherein the shackle component includes a first side with an open slot through which the latch tab extends in a closed position, and a second side having an attachment surface from which a rivet extends through the slot of the latch tab so the latch plate can slide and pivot with respect to the attachment surface.
4. The method as described in claim 3 wherein the second side of the shackle component includes a square hole which is covered by the cover rib when the latch plate is not in the closed position and to ensure the latch plate is in the closed position during use.